MU Online Season 22

MU Online Season 22 is the latest version of Webzen's MU Online, following Season 21 and its Crusader class, Imperial gear and Rakion of Oblivion. Our server runs on the newest Season 22 server files and opens on 30 October 2026: a high-exp server built for fun from your first levels all the way to max stats.

Our Season 22 server

What Season 22 brings

Season 22 is arriving in parts, the way recent seasons have. Webzen opened it in Korea with the Part 1 first update on 15 September 2026 — a combat balance pass for several classes and quality-of-life work such as new entries in the hunting record window — and followed with the Part 1 second update on 13 October. That second update is the one with substance: a new hunting ground, a higher level cap, new season rewards and a much steeper Blood Castle. Everything below comes from the official patch notes of 8 October; the names are our English renderings of the Korean originals, so the in-game spelling may differ slightly.

Arcana Library — the new endgame hunting ground

Arcana Library is the reason most players will log in. It sits deep in the forest of Aida. In the story, the MU Empire built it with Arca's help as a vault for every magical record, run by a Core of Records that kept the writing tools copying by themselves. During the long war with Kundun the archive was buried in war records and captured spellbooks; the core overloaded, the tools copied the books wrong, and the wraiths sealed inside them took shape. The Empire shut the doors. Decades later it reopens them — and sends you in to stabilise the core and clear out the Specters.

Plan your build around what the Specters resist. Every monster here carries resistance to excellent damage rate, critical damage rate and elemental critical damage rate, plus damage absorption, debuff resistance and a Shock stat. A character that leans on excellent and critical procs will feel weaker here than on the maps before it; flat damage and elemental damage hold up better.

The drops are what make it worth farming daily. Ability Crystals feed the Ability system, and Imperial Soul Crystals go into the Imperial tier:

How to farm Arcana Library

• Plan to farm from 1,750. The door opens at 1,700, but Webzen lists 1,750 as the map's hunting penalty level — the usual MU rule is that characters below it hunt at a disadvantage. Treat 1,700 to 1,749 as a look around and settle in once you pass 1,750.
• Walk in rather than pay. The Move Command costs 50,000 Zen every time; the entrance in Aida at (244, 96) is free. The update rebuilt that corner of Aida with a new gate and statues, so it is easy to find.
• Choose your element spot. MU Helper Plus can put you straight on a main or sub-main spot for one element. Pick the one that suits your pentagram and errtel setup and stay there.
• Spread out against Sorcerers. A Specter Sorcerer hits up to five characters in range and a Scythe up to four, while a Knight hits only two. A party standing in one pile takes the full splash, so give the casters room.
• Farm a little every day, on every character. The crystal limits reset daily and count per character: four Bound Ability Crystals and one unbound Ability Crystal. A short daily visit on each character earns more than one long session on a single one.
• Imperial Soul Crystals are the long-session reward. The patch notes give them no daily limit. The client update also added a separate [Bound] Imperial Soul item next to the crystal.

Level cap 1,850 and the season rewards

The character cap rises from 1,800 to 1,850. Two milestone rewards come with it, and until the next season starts you can claim both — the one for reaching level 1,750 and the one for 1,800. Each arrives as a box in your Gremory Case; throw the box on the ground and it turns into a Muun.

Watch the two clocks: you have 30 days to take the box out of the Gremory Case, and once taken it is valid for 14 days. Boxes that expire either way are gone for good — they cannot be restored.

Event and content changes

Blood Castle got much harder at the top. The castle gate and the Saint's Statue had their HP raised on every grade from 3 up — about four times on Blood Castle 3, and roughly seventeen times on Blood Castle 6, the biggest jump. Bring a party that can actually break them.

Boss Battle Together — the boss went from level 115 to 120 and from 700,000,000 to 750,000,000 HP.

Monster Soul Converter — the five converters were re-tiered with new recommended levels and new monsters whose souls they need. Webzen paused converter sales for the change and scheduled them to resume after the 15 October maintenance.

Our server runs the latest Season 22 server files. Which of these updates are live on opening day goes up in the news before 30 October.

What Season 22 builds on

If you are coming back to MU Online after a break, the last few seasons changed the endgame a lot:

• Season 21 — the Crusader class, Imperial as the 2nd Legendary item tier, Rakion of Oblivion, level cap 1,800 and required stats no longer rising with upgrade level.
• Season 20 — the Alchemist class and the Temple Guard Legendary tier.
• Season 19 — the 5th class change and the Ability system.
• Season 18 — the Illusion Knight and Artifacts.

Every earlier version is covered in the MU Online season guides, from Season 1 in 2005 onwards.

How to start

• Register an account on the website.
• Download the Season 22 client and install it.
• Log in, pick a class — every character from Dark Knight to Crusader is available — and go.
• Check the rankings and the server rules once you are in.